[BUG]: Dispacher: Exception on nullable module value (PHP 8.1)

[palcoder]

Hello,

The dispatcher will throw the following exception when you pass a null value for the module parameter in route but when you pass an empty string it works fine.

Phalcon\Dispatcher\AbstractDispatcher::setModuleName(): Passing null to parameter #1 ($moduleName) of type string is deprecated

$router->add( '/session', [ 'module' => null, 'controller' => 'session', 'action' => 'index' ] );

[niden]

Resolved in #16009